Apparatus for manufacturing tubular lining material and method for manufacturing tubular lining material using the apparatus

Abstract

To provide a manufacturing apparatus and manufacturing method for tubular lining material that can suppress variations in thickness in tubular lining material used for repairing existing pipes, thereby improving the quality of the tubular lining material after hardening. [Solution] A manufacturing apparatus 10 for tubular lining material, which manufactures a tubular lining material 70 by winding a strip-shaped prepreg 74 onto an inner film 72, comprises a mandrel 12, a feed shaft 14 having a rotation axis inclined at a predetermined angle with respect to the axial direction of the mandrel and fitted onto a roll-shaped prepreg, a winding mechanism 24 that winds the strip-shaped prepreg drawn from the roll-shaped prepreg onto the inner film by rotating the feed shaft in the circumferential direction of the mandrel, and a torque adjustment unit that adjusts the torque of the feed shaft to rotate the feed shaft so that the tension acting on the strip-shaped prepreg is substantially constant during the winding of the strip-shaped prepreg onto the inner film.

Description

Technical Field

[0001] The present invention relates to an apparatus for manufacturing a tubular lining material, a method for manufacturing a tubular lining material using the apparatus, and more particularly, to an apparatus for manufacturing a tubular lining material formed by spirally winding a strip prepreg obtained by impregnating a strip-shaped fiber base material with a curable resin and used for repairing an existing pipe, and a method for manufacturing a tubular lining material using the apparatus.

Background Art

[0002] Existing pipes such as sewer pipes deteriorate due to long-term use, and their service life is generally about 50 years. In recent years, the number of sewer pipes exceeding their service life has been increasing. In old and deteriorated sewer pipes, groundwater and earth and sand around the sewer pipe may flow into the pipe due to cracks or the like occurring in the pipeline, and this may cause a cavity in the ground, leading to ground subsidence. In addition, sewer pipes are easily affected by ground movements such as earthquakes, and various circumstances require some kind of repair at a predetermined time.

[0003] As a method for repairing an old and deteriorated existing pipe, a method of coating the inner surface of the existing pipe with a cured tubular lining material is known. The outer diameter of the tubular lining material is set to be smaller than the inner diameter of the existing pipe to be repaired. During repair, compressed air is supplied into the tubular lining material to expand the diameter of the tubular lining material, so that the outer peripheral surface of the tubular lining material is brought into close contact with the inner peripheral surface of the existing pipe. The tubular lining material used for repair is manufactured by spirally winding a strip prepreg obtained by impregnating a strip-shaped fiber base material formed of glass fiber or the like with a curable resin around a cylindrical inner film to form a tubular body.

[0004] For example, Patent Document 1 describes a method for manufacturing tubular lining material used for repairing existing pipes. This manufacturing apparatus comprises a cylindrical mandrel on which an inner film is attached, and a feed shaft on which a roll of prepreg, which is made by winding a strip of prepreg into a cylindrical shape, is attached. The feed shaft is inclined with respect to the axial direction of the mandrel. With the inner film attached to the mandrel and the roll of prepreg attached to the feed shaft, the feed shaft is rotated around the mandrel with respect to its axis, thereby winding the strip of prepreg onto the cylindrical inner film. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Special Publication No. 2003-500268 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The strip-shaped prepreg, as it is drawn from the roll-shaped prepreg and fed, is set to be under tension, thereby preventing wrinkles and sagging in the manufactured tubular lining material. Specifically, a load of a certain magnitude is applied to the feed shaft to suppress rotation, and as the strip-shaped prepreg is pulled and fed under this condition, tension is constantly applied to the strip-shaped prepreg, preventing the occurrence of wrinkles and sagging.

[0007] In conventional methods for manufacturing tubular lining materials, the diameter of the rolled prepreg gradually decreases as the strip prepreg is drawn out. Consequently, the force applied to the drawing increases, and the tension acting on the strip prepreg increases. When the tension on the strip prepreg increases, it is pulled more strongly, causing its thickness to decrease when drawn out. As a result, in tubular lining materials formed by spirally winding the strip prepreg, there is a difference in thickness between the region where the thicker strip prepreg is wound and the region where the thinner strip prepreg is wound.

[0008] Thus, when repairing existing pipes using tubular lining material with uneven thickness, uneven thickness will also occur in the hardened tubular lining material. Furthermore, in areas where the tension on the strip prepreg is high and the thickness of the tubular lining material is small, the tubular lining material may not be sufficiently expanded during construction, which can result in wrinkles remaining in the tubular lining material or reduced adhesion to the existing pipe. In addition, differences in thickness can lead to differences in the expansion rate of the tubular lining material, which can cause wrinkles to form in the tubular lining material and potentially lead to a decrease in the quality of the tubular lining material after repair.

[0009] The present invention has been made in view of the above problems, and its purpose is to provide a tubular lining material manufacturing apparatus that can suppress unevenness in thickness of the manufactured tubular lining material and improve the quality of the hardened tubular lining material, and a method for manufacturing tubular lining material using the apparatus, in a tubular lining material manufacturing apparatus for manufacturing tubular lining material used for repairing existing pipes. [Means for solving the problem]

[0010] To achieve the above objective, the apparatus for manufacturing tubular lining material according to claim 1 is: In a manufacturing apparatus for tubular lining materials, in which a strip-shaped prepreg, in which a fibrous base material is impregnated with a curable resin, is wound spirally around a cylindrical inner film, A columnar mandrel on which the inner film is attached to the outer surface, A feed shaft is positioned at a predetermined distance from the mandrel, has a rotation axis inclined at a predetermined angle with respect to the axial direction of the mandrel, and is fitted into the roll-shaped prepreg formed by winding the strip-shaped prepreg, and rotates together with the roll-shaped prepreg. A winding mechanism that rotates the feed shaft in the circumferential direction of the mandrel to wind the strip-shaped prepreg drawn from the roll-shaped prepreg onto the inner film, A torque adjustment unit is provided on the feed shaft, which can adjust the torque that rotates the feed shaft by applying a braking force to the feed shaft, and adjusts the torque so that the tension acting on the strip prepreg is substantially constant during the winding of the strip prepreg onto the inner film by the winding mechanism. It is characterized by having the following features.

[0011] In this configuration, an inner film is mounted on a mandrel, a roll of prepreg is mounted on a feed shaft, and the leading edge of the strip of prepreg drawn from the roll of prepreg is wrapped around the cylindrical inner film. When the feed shaft is rotated circumferentially around the mandrel by the winding mechanism, the strip of prepreg is sequentially drawn from the roll of prepreg and wound onto the inner film. During the winding of the strip prepreg, the torque adjustment unit adjusts the torque required to rotate the feed axis so that the tension acting on the strip prepreg remains approximately constant, regardless of the decrease in the radius of the roll prepreg. Specifically, based on the formula "torque Trq = radius R of the roll prepreg × tension T", the torque of the feed axis is adjusted so that the torque of the feed axis decreases as the radius of the roll prepreg decreases. In this way, by keeping the tension acting on the strip prepreg during winding nearly constant, it is possible to suppress unevenness in the thickness of the manufactured tubular lining material and the formation of wrinkles. As a result, the quality of the tubular lining material installed and hardened inside existing pipes can be improved.

[0012] Furthermore, the invention described in claim 2 relates to the manufacturing apparatus for the tubular lining material described in claim 1, The torque adjustment unit is A radius calculation means for calculating the radius of the roll-shaped prepreg, which decreases as the strip-shaped prepreg is pulled out, from the rotation angle of the feed axis, A braking force adjustment means that reduces the braking force applied to the feed shaft in accordance with the reduction in radius calculated by the radius calculation means, It is characterized by having the following features.

[0013] In this configuration, the radius of the roll-shaped prepreg decreases by the thickness of the strip-shaped prepreg with each rotation of the feed shaft, but the radius of the roll-shaped prepreg can always be calculated by the radius calculation means. Furthermore, the braking force adjustment means adjusts the braking force on the feed shaft in accordance with the calculated radius of the roll-shaped prepreg. That is, when the radius of the roll-shaped prepreg is large, the braking force of the feed shaft is increased to make it difficult to rotate, and as the radius of the roll-shaped prepreg decreases, the braking force of the feed shaft is decreased to make it easier to rotate, thereby maintaining the tension of the drawn-out strip-shaped prepreg at a nearly constant level.

[0014] Furthermore, the invention described in claim 3 relates to the manufacturing apparatus for the tubular lining material described in claim 2, The braking force adjustment means is characterized by being an air brake that applies braking force to the feed shaft by air pressure.

[0015] With this configuration, by using air pressure, it is possible to easily fine-tune the braking force that suppresses the rotation of the feed axis, thereby enabling the fine-tuning of the tension applied to the strip prepreg to manufacture tubular lining material with uniform thickness.

[0016] Furthermore, the invention described in claim 4 relates to the apparatus for manufacturing the tubular lining material described in claim 1 or 2, The winding mechanism is provided with a first support portion that supports one end of the feed shaft and a second support portion that supports the other end of the feed shaft, The first and / or second support portion is characterized by being equipped with a position adjustment mechanism that allows the position of the end of the supported feed shaft to be changed or adjusted.

[0017] With this configuration, the position adjustment mechanism of the first and / or second support parts allows for the adjustment of the inclination angle of the feed shaft relative to the axis of the mandrel by moving the position of one end and / or the other end of the feed shaft. This makes it possible to increase the inclination angle of the feed shaft relative to the mandrel to reduce the thickness of the manufactured tubular lining material, or decrease the inclination angle of the feed shaft relative to the mandrel to increase the thickness of the manufactured tubular lining material. Therefore, in addition to ensuring a uniform thickness and expansion ratio of the tubular lining material by equalizing the tension of the strip prepreg, it also becomes possible to easily adjust the thickness of the tubular lining material according to the diameter of the existing pipe to be repaired.

[0018] Furthermore, the invention described in claim 5 relates to the manufacturing apparatus for the tubular lining material described in claim 4, The position adjustment mechanism is, The winding mechanism is characterized by having a screw shaft attached to it and extending radially in the direction of the mandrel, a nut that can reciprocate along the screw shaft, and a support connected to the nut that supports the end of the feed shaft.

[0019] With this configuration, the position of the end of the feed shaft can be changed by moving a nut on the ball screw while the end of the feed shaft is supported by a support, thereby allowing for fine adjustment of the feed shaft's tilt angle. This enables not only uniformity of the thickness by equalizing the tension of the strip prepreg, but also fine adjustment of the thickness of the tubular lining material according to the diameter of the existing pipe to be repaired.

[0020] Further, the method for manufacturing a tubular lining material according to claim 6 is a method for manufacturing a tubular lining material using the manufacturing apparatus for a tubular lining material according to claim 1, comprising: an inner film mounting step of mounting the inner film on the outer peripheral surface of the mandrel; a roll-shaped prepreg mounting step of mounting a roll-shaped prepreg formed by winding the strip-shaped prepreg on the outer peripheral surface of the feed shaft; a winding step of winding the strip-shaped prepreg on the inner film by winding the leading end portion of the strip-shaped prepreg around the cylindrical inner film and rotating the feed shaft in the circumferential direction of the mandrel by the winding mechanism; In the winding step, the torque adjustment unit reduces the braking force applied to the feed shaft so that the tension acting on the strip-shaped prepreg becomes substantially constant corresponding to the roll-shaped prepreg whose radius gradually decreases during the winding of the strip-shaped prepreg on the inner film, thereby adjusting the torque of the feed shaft.

[0021] According to this configuration, the inner film that becomes the inner peripheral surface of the finished product is mounted on the outer peripheral surface of the mandrel, the roll-shaped prepreg is mounted on the feed shaft, and with the leading end portion of the strip-shaped prepreg drawn out from the roll-shaped prepreg wound around the cylindrical inner film, when the feed shaft is rotated in the circumferential direction of the mandrel, the strip-shaped prepreg is sequentially drawn out from the roll-shaped prepreg and wound on the inner film. Then, while the strip-shaped prepreg is being wound, the torque of the feed shaft is adjusted so that the tension acting on the strip-shaped prepreg becomes substantially constant regardless of the decrease in the radius of the roll-shaped prepreg. That is, the braking force of the feed shaft is reduced and the torque is adjusted so that the torque of the feed shaft decreases as the radius of the roll-shaped prepreg decreases. In this way, by keeping the tension acting on the strip prepreg during winding approximately constant, it is possible to suppress unevenness in the thickness of the manufactured tubular lining material and the formation of wrinkles, thereby improving the quality of the tubular lining material that is installed in existing pipes and hardened. [Effects of the Invention]

[0022] According to the manufacturing apparatus for tubular lining material and the method for manufacturing tubular lining material using the apparatus according to the present invention, when drawing out a strip of prepreg from a roll of prepreg and winding the strip of prepreg spirally onto a cylindrical inner film, the torque adjustment unit adjusts the torque of the feed axis of the roll of prepreg, thereby maintaining a substantially constant tension on the strip of prepreg. As a result, the thickness of the strip of prepreg drawn out from the roll of prepreg is maintained uniformly, and the thickness of the manufactured tubular lining material is made uniform, suppressing unevenness in thickness. This prevents parts of the tubular lining material from not expanding sufficiently or differences in the expansion rate of the tubular lining material from occurring, which can lead to wrinkle formation in parts of the tubular lining material, thereby improving the quality of the tubular lining material after repair. [Brief explanation of the drawing]

[0023] [Figure 1] This is a schematic diagram showing the process of manufacturing tubular lining material. [Figure 2] This is a perspective view of a partially fractured tubular lining material. [Figure 3] This is a perspective view of a manufacturing apparatus for tubular lining material, which is one embodiment of the present invention. [Figure 4] This is a cross-sectional view of the manufacturing apparatus at the height of line AA in Figure 1. [Figure 5] This is an explanatory diagram showing a second support part that supports the second end of the feed shaft. [Figure 6] This is an explanatory diagram showing how a strip of prepreg is wound in a spiral pattern. [Figure 7]This diagram illustrates the torque adjustment of the feed axis performed by the torque adjustment unit. [Figure 8] This is a perspective view showing another embodiment of the position adjustment mechanism. [Figure 9] This is an explanatory diagram of a method for repairing existing pipes using tubular lining material. [Modes for carrying out the invention]

[0024] Figure 1 is a schematic diagram showing the manufacturing process of the tubular lining material 70, and Figure 2 is a partially broken perspective view of the tubular lining material. The tubular lining material 70 is used for repairing and rehabilitating existing pipes such as sewer pipes and water supply pipes, and is formed in a tubular shape that can cover the inner wall surface of existing pipes.

[0025] As shown in Figure 2, the tubular lining material 70 has a cylindrical inner film 72 that forms the inner surface, a cylindrical outer film 76 that forms the outer surface, and a cylindrical fiber-reinforced resin layer 75 located between them. In this embodiment, roving cloths 77a and 77b, which are made of plain woven roving, are arranged between the fiber-reinforced resin layer 75 and the outer film 76. The roving cloths 77a and 77b are formed in a strip shape that extends long in the axial direction of the tubular lining material 70. In the annular lining material 70 of this embodiment, the two strip-shaped roving cloths 77a and 77b are arranged to face each other across the central axis of the tubular lining material 70. The inner film 72 and the outer film 76 can be made of, for example, polyethylene film, polypropylene film, polyethylene terephthalate film, etc.

[0026] The fiber-reinforced resin layer 75 is a layer composed of a fiber-reinforced resin material obtained by impregnating a fiber substrate with a curable resin composition. The fiber substrate contains at least one type of reinforcing fiber selected from the group consisting of glass fiber, carbon fiber, and aramid fiber. The curable resin composition may be a resin composition that hardens with light or a resin composition that hardens with heat, and in either case, a polymerizable resin such as vinyl ester resin or unsaturated polyester resin can be dissolved in a solvent such as styrene. The solvent may not contain styrene. In the case of a photocurable resin composition, a photopolymerization initiator such as an azo compound is added, and in the case of a thermosetting resin composition, an organic peroxide that reacts to heat is added. When the fiber-reinforced resin layer 75 is composed of a photocurable resin composition, the inner film 72 is made of a material that is transparent to the irradiated light, and the outer film 76 is made of a material that is light-shielding. As described later, the fiber-reinforced resin layer 75 is a layer formed by laminating strip-shaped prepregs 74, which are strip-shaped fiber substrates impregnated with a curable resin composition, and the thickness of the fiber-reinforced resin layer 75 can be adjusted by the number of layers of strip-shaped prepregs 74. For example, if the thickness of the strip-shaped prepreg 74 is 0.8 mm, it is preferable that the number of layers be 6 or more.

[0027] Next, the manufacturing method of the tubular lining material 70 will be described using Figure 1. The tubular lining material 70 is formed by spirally winding a strip-shaped prepreg 74, which is made by impregnating a curable resin composition with a strip-shaped fibrous base material, onto the outer circumference of a cylindrical inner film 72 to form a tubular body 78. After attaching axially extending roving cloths 77a and 77b to the outer surface of this tubular body 78, the outer surface of the tubular body 78 is covered with two strip-shaped outer films 76a and 76b. The curable resin composition constituting the strip-shaped prepreg 74 is viscous in its uncured state.

[0028] A cylindrical winding mandrel 12 is used in the manufacture of the tubular lining material 70. A cylindrical inner film 72 is attached to the outer surface of the mandrel 12 (inner film attachment process). The inner film 72 serves to protect the inner surface of the tubular lining material 70.

[0029] Next, a strip-shaped prepreg 74 is wound spirally around the outer surface of the inner film 72 (prepreg winding process). The strip-shaped prepreg 74 forms a fiber-reinforced resin layer 75 in the tubular lining material 70 shown in Figure 2. In the example shown in Figure 1, three roll-shaped prepregs 73-1, 73-2, and 73-3, which are formed by winding the strip-shaped prepreg 74 into a cylindrical shape, are arranged around the mandrel 12. Each roll-shaped prepreg 73-1, 73-2, and 73-3 is rotatably supported on feed shafts 14-1, 14-2, and 14-3. Each feed shaft 14-1, 14-2, and 14-3 is provided with a torque adjustment unit 16 for adjusting the torque of the feed shaft 14. Note that at least one roll-shaped prepreg 73 is required on the mandrel 12. The number of roll-shaped prepregs 73 and the angle at which the strip-shaped prepreg 74 is spirally wound around the mandrel 12 (i.e., the number of turns of the strip-shaped prepreg 74 per unit length) can be appropriately set according to the thickness of the tubular lining material 70 to be manufactured. In this way, by winding the strip-shaped prepreg 74 around the inner film 72, the outer surface of the inner film 72 is covered with fiber-reinforced resin material, and a tubular body 78 is formed having the inner film 72 and a fiber-reinforced resin layer 75 formed by winding the strip-shaped prepreg 74. An endless conveying belt (not shown) is installed on the outer surface of the mandrel 12. This conveying belt contacts the inner surface of the inner film 72 and feeds the inner film 72 in the direction of arrow B in Figure 1.

[0030] Next, roving cloths 77a and 77b are attached to the outer circumferential surface of the tubular body 78. In the example shown in Figure 1, roll-shaped roving cloths, formed by winding strip-shaped roving cloths 77a and 77b into a cylindrical shape, are positioned above and below the tubular body 78, with the tubular body 78 sandwiched in between. The strip-shaped roving cloths 77a and 77b are attached to the upper and lower surfaces of the flattened tubular body 78, respectively, along the axial direction of the annular body 78. The mandrel 12 extends to just before the attachment area of ​​the roving cloths 77a and 77b. The roving cloths 77a and 77b are constructed by impregnating a resin into a base material made of long-fiber glass fibers, and are configured to be substantially non-stretchable in the longitudinal direction (i.e., the axial direction of the tubular lining material 70). By attaching the roving cloths 77a and 77b, it is possible to prevent the spirally wound strip-shaped prepreg 74 from shifting position in the axial direction. In this embodiment, the combined width of the two roving cloths 77a and 77b is set to be shorter than the circumference of the tubular body 78, and each roving cloth 77a and 77b is attached to the tubular body 78 at intervals in the circumferential direction.

[0031] Next, the outer surface of the tubular body 78 is covered with an outer film 76 (outer film covering step). In the example shown in Figure 1, roll-shaped afterfilms, formed by winding strip-shaped outer films 76a and 76b into a cylindrical shape, are arranged above and below the tubular body 78. The roll-shaped afterfilms are rotatably supported by outer film feed shafts 17a and 17b. The outer surface of the tubular body 78 is covered by two strip-shaped outer films 76a and 76b fed out from each roll-shaped outer film. The ends of the two strip-shaped outer films 76a and 76b are fused together at both ends in the width direction by heat-sealing them using a heat-sealing device 18. As a result, the tubular body 78 is enclosed within a single cylindrical outer film 76. The widths of the two strip-shaped outer films 76a and 76b are set so that their combined length is longer than the circumference of the tubular body 78.

[0032] The tubular body 78 and tubular lining material 70 are fed at a constant speed in the axial direction of the tubular lining material 70 by a conveyor belt (not shown) installed on the outer surface of the mandrel 12 and one or more conveyor rollers 11 positioned on the production line. The conveyor belt and the conveyor rollers 11 are synchronized so that their conveying speeds are equal. The manufactured tubular lining material 70 is crushed and folded for storage and transport. In the example shown in Figure 1, the folded tubular lining material 70 is stored in a storage box 19.

[0033] Next, using Figures 3 and 4, we will describe the manufacturing apparatus 10 for the tubular lining material (hereinafter also simply referred to as "manufacturing apparatus 10") used in the manufacturing method of the tubular lining material 70. The manufacturing apparatus 10 shown in Figures 3 and 4 is used in the strip prepreg winding process in the manufacturing line for the tubular lining material 70, in which a strip prepreg 74 is wound spirally around the outer surface of the inner film 72.

[0034] The manufacturing apparatus 10 comprises a mandrel 12, a feed shaft 14 positioned radially outward from the mandrel 12, a torque adjustment unit 16 for adjusting the torque that rotates the feed shaft 14, and a winding mechanism 24 for moving the feed shaft 16 relative to the mandrel 12. The feed shaft 14, the torque adjustment unit 16, and the relative movement means 24 are attached to an apparatus frame 22 that forms the manufacturing enclosure. In this embodiment, the mandrel 12 is configured to be separable from the apparatus frame 22. The apparatus frame 22 is formed by assembling rod-shaped members into a rectangular parallelepiped. In Figures 3 and 4, the mandrel 12 is shown with dashed lines to facilitate understanding of the feed shaft 14, the torque adjustment unit 16, and the winding mechanism 24. Note that in Figures 3 and 4, a roll-shaped prepreg 73 is shown mounted on one of the three feed shafts 14-1, 14-2, and 14-3, specifically on one feed shaft 14-1.

[0035] As previously described, the mandrel 12 is fitted with a cylindrical inner film 72 and is formed in a linear columnar shape. The mandrel 12 has a cantilever structure in which one end (the left end in Figure 4) is supported by a support member (not shown). The mandrel 12 can be formed in a hollow columnar shape to reduce weight. The outer diameter of the mandrel 12 is set appropriately according to the inner diameter of the tubular lining material 70 to be manufactured. In this embodiment, a cylindrical mandrel 12 is used, but the mandrel 12 can be inserted into the inner film 72 and hold the inner film 72 in a substantially cylindrical shape, and the mandrel 12 may have a polygonal cross-section. For example, the mandrel 12 may be a columnar shape made up of a plurality of rod-shaped bodies bundled together, and the outer diameter can be changed by moving the distance between each rod-shaped body closer together or further apart. Furthermore, the mandrel 12 is equipped with an annular conveying belt (not shown) that contacts the inner surface of the inner film 72 and feeds out the inner film 72. The mandrel 12 can be configured to move forward and backward in the axial direction, and the inner film 72 can be attached to the mandrel 12 while the mandrel 12 is pulled out from the device frame 22.

[0036] The feed shaft 14 is positioned radially outward of the mandrel 12 at a predetermined distance. The feed shaft 14 has a rotation axis inclined at a predetermined angle with respect to the axial direction of the mandrel 12, and rotates together with the roll-shaped prepreg 73 when fitted into the roll-shaped prepreg 73. The roll-shaped prepreg 73 is formed by winding a strip-shaped prepreg 74 around a cylindrical core member, and the feed shaft 14 passes through this core member. The feed shaft 14 is provided with a projection (not shown) that can be projected from its outer surface by air pressure. With this projection retracted into the feed shaft 14, the feed shaft 14 is fitted onto the core member of the roll-shaped prepreg 73, and then the projection is made to protrude from the outer surface of the feed shaft 14, thereby fixing the roll-shaped prepreg 73 to the feed shaft 14. In this embodiment, the feed shaft 14 is attached to the apparatus frame 22 via a winding mechanism 24.

[0037] The winding mechanism 24 is provided on the device frame 22 and rotates the feed shaft 14 in the circumferential direction of the mandrel 12, thereby winding the strip-shaped prepreg 74, which has been drawn out from the roll-shaped prepreg 73 mounted on the feed shaft 14, onto the inner film 72 mounted on the mandrel 12. The winding mechanism 24 comprises a pair of annular bodies 24a and 24b attached to the device frame 22, and a drive unit (not shown) that rotates the pair of annular bodies 24a and 24b.

[0038] The pair of annular bodies 24a and 24b are each formed in the shape of an annular plate with an inner diameter larger than the outer diameter of the mandrel 12. The pair of annular bodies 24a and 24b are arranged at a predetermined distance in the axial direction of the mandrel 12, surrounding the outer circumference of the mandrel 12, such that the central axis of the mandrel 12 and the central axes of the pair of annular bodies 24a and 24b are coaxial. Each annular body 24a and 24b is mounted on the device frame 22 so as to be rotatable around its central axis. The drive unit supplies power to rotate the pair of annular bodies 24a and 24b. The drive unit can be mounted on the device frame 22 or on at least one of the pair of annular bodies 24a and 24b, and if mounted on the annular bodies 24a and 24b, it can be configured to rotate together with the annular bodies 24a and 24b. The pair of annular bodies 24a and 24b are configured to rotate synchronously by the drive unit.

[0039] The winding mechanism 24 further includes a first support portion 30 that supports the first end 14a (one end) of the feed shaft 14, and a second support portion 40 that supports the second end 14b (the other end) of the feed shaft 14. Of the pair of annular bodies 24a and 24b, the first support portion 30 is provided on one annular body 24a, and the second support portion 40 is provided on the other annular body 24b. The support portions 30 and 40 are provided on the opposing surfaces of the pair of annular bodies 24a and 24b, and the second support portion 40 is configured to allow the second end 14b of the feed shaft 14 to move relative to the mandrel 12.

[0040] The feed shaft 14 is a rod-shaped shaft member that rotatably supports a roll-shaped prepreg 73, which is formed by winding a strip-shaped prepreg 74 into a cylindrical shape, and is arranged at predetermined intervals on the radially outer side of the mandrel 12. In the manufacturing apparatus 10 of this embodiment, as shown in Figure 3, three feed shafts 14-1, 14-2, and 14-3 are arranged at intervals in the circumferential direction of the mandrel 12, but the number of feed shafts 14 can be one or more. Each feed shaft 14 may be configured to be detachable from a pair of annular bodies 24a and 24b. In the manufacturing process of the tubular lining material 70, both ends 14a and 14b of the feed shaft 14 are fixed to the pair of annular bodies 24a and 24b via their respective support parts 30 and 40.

[0041] As shown in Figure 4, the first support portion 30 is attached to a bracket 31 protruding from the surface of the annular body 24a and has a support shaft 32 that pivotally supports the first end 14a of the feed shaft 14 so that the second end 14b of the feed shaft 14 can pivot in the radial direction of the mandrel 12. The support shaft 32 is fixedly installed at a certain distance from the axis of the mandrel 12, and the feed shaft 14 is configured to pivot about the support shaft 32. The pivotally supported first end 14a of the feed shaft 14 is installed such that the distance from the axis of the mandrel 12 to the first end 14a is constant.

[0042] As shown in Figure 5, the second support portion 40 is equipped with a position adjustment mechanism 41 that allows the position of the second end 14b of the feed shaft 14 to be changed and adjusted while supporting the second end 14b of the feed shaft 14. In this embodiment, the position adjustment mechanism 41 is configured to allow the second end 14b to be continuously moved radially outward and inward of the mandrel 12. The position adjustment mechanism 41 includes a support member 48 that supports the second end 14b of the feed shaft 14, a guide portion 42 that guides the movement of the support member 48, and a ball screw mechanism 44 that moves the support member 48 along the guide portion 42. In this embodiment, the guide portion 42 and the ball screw mechanism 44 are attached to a bracket 43 fixed to the annular body 24b.

[0043] The ball screw mechanism 44 comprises a plate-shaped base 44a, a screw shaft 44c mounted on the base 44a via a bearing 44b, an operating handle 44d for rotating the screw shaft 44c, a nut 44e attached to the screw shaft 44c, and an engaging member 45 coupled to the nut 44e. The base 44a is fixed to the annular body 24b, and the screw shaft 44c extends on the base 44a in the radial direction of the annular body 24b (i.e., the radial direction of the mandrel 12). The operating handle 44d is attached to one end of the screw shaft 44d, and the screw shaft 44c can be rotated around its axis by manually operating the operating handle 44d. The nut 44e is configured to reciprocate on the screw shaft 44c by rotating the screw shaft 44c. The engaging member 45 is formed in a substantially rectangular plate shape and reciprocates along the length of the screw shaft 44c together with the nut 44e.

[0044] The guide section 42 comprises a pair of arc-shaped rails 42a fixed to the annular body 24b, and a base 42b that is movable on the pair of rails 42a and on which a support 48 is mounted and fixed. The pair of rails 42a are arranged in parallel with the screw shaft 44c so as to extend radially along the mandrel 12. The base 42b is connected to an engaging member 45 of the ball screw mechanism 44, and the base 42b reciprocates on the pair of rails 42a as the engaging member 45 reciprocates on the screw shaft 44c. In this embodiment, the base 42d and the engaging member 45 are connected in such a manner that an engaging projection 42c protruding from the base 42b is inserted into an engaging hole 45a formed in the engaging member 45. The support 48 is connected to a nut 44e via the base 42b and the engaging member 45.

[0045] The position adjustment mechanism 41 allows the second end 14b of the feed shaft 14 to be moved back and forth along the rail 42a of the guide section 42 by manually operating the operating handle 44d of the ball screw mechanism 44 while the second end 14b of the feed shaft 14 is supported by the support 48. This allows the second end 14b of the feed shaft 14 to be moved closer to or further away from the mandrel 12, and as shown in Figure 6, the inclination angle θ of the feed shaft 14 relative to the mandrel 12 can be continuously changed and adjusted. Figure 6 shows the process of pulling out a strip of prepreg 74 from a roll of prepreg 73 mounted on the feed shaft 14 and winding the strip of prepreg 74 spirally around an inner film 72 mounted on the mandrel 12.

[0046] In this embodiment, as shown in Figure 4, the support position of the second end 14b of the feed shaft 14 by the second support portion 40 is configured to be radially outward of the mandrel 12 than the support position of the first end 14a of the feed shaft 14 by the first support portion 30. In the manufacturing process of the tubular lining material 70, the direction in which the inner film 72 is fed out is in the direction of arrow B, that is, from the first end 14a to the second end 14b. However, the manufacturing apparatus 10 may also be configured so that the first end 14a side is radially outward of the mandrel 12 than the second end 14b. In this case, the direction in which the inner film 72 is fed out is in the opposite direction of arrow B, that is, from the second end 14b to the first end 14a.

[0047] With its first and second ends 14a and 14b supported by the first and second support parts 30 and 40, the feed shaft 14 rotates around the mandrel 12 in the circumferential direction of the mandrel 12 by operating the drive unit 24c of the winding mechanism 24, thereby rotating the pair of annular bodies 24a and 24b. The winding mechanism 24 rotates the feed shaft 14 in the circumferential direction of the mandrel 12, as shown in Figure 6, by winding the strip-shaped prepreg 74 drawn from the roll-shaped prepreg 73 mounted on the feed shaft 14 onto the inner film 72 mounted on the mandrel 12.

[0048] The feed shaft 14 is provided with a torque adjustment unit 16 for adjusting the torque of the feed shaft 14. The torque adjustment unit 16 allows the torque of the feed shaft 14 to be adjusted by applying a braking force to the feed shaft 14. The torque adjustment unit 16 adjusts the torque of the feed shaft 14 so that the tension acting on the strip prepreg 74 is approximately constant during the winding of the strip prepreg 72 onto the inner film 72 by the winding mechanism 24. Specifically, when the torque adjustment unit 16 feeds the strip prepreg 74, which is drawn out from the roll prepreg 73 mounted on the feed shaft 14, toward the mandrel 12, it adjusts the torque so that the tension acting on the strip prepreg 74 is approximately constant according to the radius of the roll prepreg 73.

[0049] Torque adjustment is performed based on the following equation (1). Trq = R × T ... Equation (1) Here, Trq is the torque of the feed axis 14, R is the radius of the roll-shaped prepreg 73, and T is the tension acting on the strip-shaped prepreg 74 drawn from the roll-shaped prepreg 73.

[0050] As shown in Figure 7, the torque adjustment unit 16 includes a braking force adjustment means 16a that applies a braking force to suppress the rotation of the feed shaft 14, and a control unit 16b that controls the operation of the braking force adjustment means 16a. The braking force adjustment means 16a can be, for example, a fluid pressure brake that applies a braking force to suppress the rotation of the feed shaft by the pressure of a gas or liquid. In this embodiment, the braking force adjustment means 16a is configured as an air brake that applies a braking force to the feed shaft 14 by air pressure. The air brake is attached to at least one of the first and second ends 14a, 14b of the feed shaft 14, and in the example shown in Figure 3, it is attached to the first end 14a of the feed shaft 14. The braking force adjustment means 16a includes a pressure adjustment regulator that controls the air pressure and flow rate of the air brake, a pressure gauge for checking the pressure of the air brake, and a hand valve for manually changing the pressure of the air brake. The pressure adjustment regulator has a low-pressure pressure adjustment regulator that controls the low-pressure range and a high-pressure pressure adjustment regulator that controls the high-pressure range. Although not shown in the diagram, a pressure regulator, pressure gauge, and hand valve are attached to the annular body 24a.

[0051] The control unit 16b is configured to include, for example, an information processing unit such as a CPU, a storage unit such as RAM or ROM, and an input / output interface. The control unit 16b is electrically connected to a rotation angle sensor 16c that detects the rotation angle of the feed axis 14. The control unit 16b has a radius calculation means that calculates the radius of the roll-shaped prepreg 73 mounted on the feed axis 14 based on the detection result from the rotation angle sensor 16c. The radius calculation means may be a detector that detects the radius of the roll-shaped prepreg 73 using a laser. This detector is attached to the annular body 24a or 24b and rotates around the mandrel 12 together with the roll-shaped prepreg 73.

[0052] The control unit 16b controls the operation of the braking force adjustment means 16a based on the radius of the roll-shaped prepreg 73 calculated by the radius calculation means. Since the torque of the feed shaft 14 increases with increasing axial force of the feed shaft 14, in this embodiment, the torque of the feed shaft 14 is adjusted by adjusting the axial force of the feed shaft 14 using the air brake, which is the braking force adjustment means 16a. Specifically, the operation of the braking force adjustment means 16a is controlled to reduce the braking force applied to the feed shaft 14 in response to a decrease in the radius of the roll-shaped prepreg 73 calculated by the radius calculation means.

[0053] The torque adjustment unit 16 may be configured to continuously reduce the torque according to the radius of the roll-shaped prepreg 73, or it may be configured to set multiple torque values ​​in advance according to the radius of the roll-shaped prepreg 73 and reduce the torque discontinuously.

[0054] Next, a method for manufacturing the tubular lining material 70 using the manufacturing apparatus 10 described above will be explained. First, an inner film 72 is attached to the outer surface of the mandrel 12 (inner film attachment step). Then, a roll of prepreg 73 is attached to the feed shaft 14 (roll of prepreg attachment step). The roll of prepreg 73 is fixed to the feed shaft 14 with the feed shaft 14 fitted into the hollow part of the core member of the cylindrical roll of prepreg 73. The inclination angle θ of the feed shaft 14 with respect to the axial direction of the mandrel 12 (see Figure 6) can be adjusted by a position adjustment mechanism 41 provided on the second support part 40 of the manufacturing apparatus 10. Specifically, with the first end 14a of the feed shaft 14 supported by the first support part 30, and the second end 14b of the feed shaft 14 supported by the support member 48 as shown in Figure 5, the operating handle 44d is manually operated to rotate the screw shaft 44c, thereby moving the second end 14b closer to or further away from the mandrel 12. This sets the inclination angle θ to a predetermined angle corresponding to the thickness of the fiber-reinforced resin layer 75 (see Figure 2) of the manufactured tubular lining material 70. The thickness of the fiber-reinforced resin layer 75 can be set by the number of roll-shaped prepregs 73 attached to the winding mechanism 24 and the inclination angle θ of each roll-shaped prepreg 73 relative to the mandrel 12. The order of the inner film mounting process and the roll-shaped prepreg mounting process may be changed as appropriate, or they may be performed simultaneously. Furthermore, the inclination angle θ of the feed shaft 14 may be set before or after mounting the roll-shaped prepregs 73.

[0055] With the inner film 72 and roll-shaped prepreg 73 set on the mandrel 12 and feed shaft 14 of the manufacturing apparatus 10, the leading edge of the strip-shaped prepreg 74 is pulled out from the roll-shaped prepreg 73 and wound around the inner film 72. In this state, the winding mechanism 24 is activated while the inner film 72 is advanced in the axial direction of the mandrel 12 by a feed roller or the like (not shown). As a result, the strip-shaped prepreg 74 is wound spirally around the inner film 72, as shown in Figure 6 (winding process).

[0056] In the winding process, a torque adjustment unit 16 provided on each feed shaft 14 applies a braking force to each feed shaft 14 so that tension is applied to the strip-shaped prepreg 74. In the winding process, the strip-shaped prepreg 74 is sequentially drawn out from the roll-shaped prepreg 73, causing the radius of the roll-shaped prepreg 73 to decrease. The torque adjustment unit 16 adjusts the torque of each feed shaft 14 according to the radius of the roll-shaped prepreg 73 mounted on each feed shaft 14. Specifically, the radius calculation means of the control unit 16b calculates the radius of the roll-shaped prepreg 73, which decreases as the strip-shaped prepreg 72 is drawn out, from the rotation angle of the feed shaft 14 detected by the rotation angle sensor 16c. Then, the control unit 16b adjusts the braking force applied to the feed shaft 14 by the braking force adjustment means 16a so that the tension acting on the strip-shaped prepreg remains approximately constant, according to the calculated radius. In other words, as the radius of the roll-shaped prepreg 73 gradually decreases during the winding of the strip-shaped prepreg 72, the braking force applied to the feed shaft 14 is reduced so that the tension acting on the strip-shaped prepreg 74 remains approximately constant. In this way, when the radius 73 of the roll-shaped prepreg is large, the braking force of the feed shaft 14 is increased to make it difficult to rotate, and as the radius of the roll-shaped prepreg 73 decreases, the braking force of the feed shaft 14 is reduced to make it easier for the feed shaft 14 to rotate, thereby maintaining the tension of the drawn-out strip-shaped prepreg 74 at approximately constant levels.

[0057] In this embodiment, since an air brake capable of suppressing the rotation of the rotating shaft 14 by air pressure is used as the braking force adjustment means 16a, the braking force that suppresses the rotation of the feed shaft can be easily fine-tuned. This makes it possible to precisely adjust the tension of the strip prepreg 74.

[0058] In the tubular lining material 70 manufactured through such a winding process, the thickness of the fiber-reinforced resin layer 75 is uniform in the longitudinal direction, suppressing unevenness in thickness and wrinkle formation in the tubular lining material 70. If the tension applied to the strip-shaped lining material 74 is large during manufacturing, the strip-shaped prepreg 74 may be wound too tightly, and the manufactured tubular lining material 70 may not be able to expand sufficiently in diameter during installation. In the tubular lining material 70 manufactured by the manufacturing apparatus 10 of this embodiment, the tension applied to the strip-shaped lining material 74 is adjusted to be constant, so an appropriate diameter expansion ratio can be ensured, resulting in good adhesion to the existing pipe 80 and suppression of wrinkle formation. This makes it possible to improve the quality of the tubular lining material when it is installed in the existing pipe and hardened.

[0059] Furthermore, in the manufacturing apparatus 10 of this embodiment, with the first end 14a of the feed shaft 14 supported by the first support portion 30, the inclination angle θ of the feed shaft 14 with respect to the axial direction of the mandrel 12 can be adjusted by moving the second end 14b of the feed shaft 14 using the position adjustment mechanism 41 provided on the second support portion 40. As a result, in the manufacturing apparatus 10 of this embodiment, in addition to making the thickness constant by making the tension of the strip prepreg 74 uniform, it is also possible to easily adjust the thickness of the tubular lining material 70 according to the pipe diameter of the existing pipe to be repaired. Moreover, with the second end 14b of the feed shaft 14 supported by the second support portion 40, the inclination angle θ of the feed shaft 14 can be finely adjusted by operating the operating handle 44d to move the second end 14b along the guide portion 42, thus enabling fine adjustment of the thickness of the tubular lining material 70 to an appropriate thickness according to the pipe diameter of the existing pipe to be repaired.

[0060] Next, another embodiment of the position adjustment mechanism 41 constituting the second support portion 40 of the manufacturing apparatus 10 will be described using Figure 8. In Figure 8, components having the same function as the position adjustment mechanism 41 shown in Figure 5 are denoted by the same reference numerals. The position adjustment mechanism 41 of this embodiment includes a support member 48 that supports the second end portion 14b, a guide portion 42 that guides the movement of the support member 48, and a ball screw mechanism 44 that moves the support member 48 along the guide portion 42. The guide portion 42 and the ball screw mechanism 44 are attached to the annular body 24b via a bracket 43. The bracket 43 is fixedly installed on the surface of the annular body 24b that faces the other annular body 24a. The bracket 43 has a first bracket portion 43a that supports the ball screw mechanism 44 and a second bracket portion 43b that supports the guide portion 42.

[0061] The ball screw mechanism 44 comprises a plate-shaped base 44a fixed to the first bracket portion 43a, a screw shaft 44c mounted on the base 44a via bearings 44b, and an operating handle 44d. The screw shaft 44c extends radially from the annular body 24d. The base 44a is fixed to the first wall portion 43a of the support plate 43. Bearings 44b are provided at both ends of the screw shaft 44c and rotatably support the screw shaft 44c. The operating handle 44d is provided at one end of the screw shaft 44c. By operating the operating handle 44d, the screw shaft 44c can be rotated around its axis. The operating handle 44d has a gripping portion that protrudes substantially parallel to the screw shaft 44c and is grasped by the user, and the screw shaft 44c can be rotated by rotating the gripping portion around the screw shaft 44c. A nut 44e is screwed onto the screw shaft 44c, and an engaging member 45 is attached to the nut 44e. By operating the operating handle 44d and rotating the screw shaft 44c, the nut 44e and the engaging member 45 can be moved back and forth in the axial direction of the screw shaft 44c.

[0062] The guide section 42 comprises a pair of arc-shaped rails 42a fixed to the annular body 24b, and a base 42b that is movable on the pair of rails 42a and on which a support member 48 is mounted and fixed. The pair of rails 42a are installed on the second bracket section 43b. The pair of rails 42a are arranged to extend radially along the mandrel 12. The base 42b is connected to an engaging member 45, and the engaging member 45 is configured to reciprocate along the rails 42a by reciprocating along the screw shaft 44c. The position adjustment mechanism 41 allows the second end 14b of the feed shaft 14 to be reciprocated along the rails 42a of the guide section 42 by manually operating the operating handle 44d while the support member 48 is supporting the second end 14b of the feed shaft 14. This allows the second end 14b to be continuously moved radially outward or inward of the mandrel 12, and the inclination angle of the feed axis 14 can be finely adjusted.

[0063] Figure 9 is an explanatory diagram of a method for repairing existing pipes using tubular lining material 70, and shows a method for repairing a sewer pipe buried underground as an example of an existing pipe 80.

[0064] The existing pipe 80 to be repaired is located between two manholes 82-1 and 82-2, connecting them. Water-stopping members 90-1 and 90-2 are installed inside the existing pipe 81-1 located upstream of the existing pipe 80 to be repaired, or inside the existing pipes 81-1 and 82-2 located both upstream and downstream, to block the flow of sewage. As the water-stopping members 90-1 and 90-2, rubber packers that expand when a fluid such as air is supplied inside can be used.

[0065] The tubular lining material 70 is introduced into the existing pipe 80 from one manhole 82-1 (introduction process). After introduction, both ends of the tubular lining material 70 are closed with closing members 92-1 and 92-2. In this state, compressed air is introduced into the closed space 84 inside the tubular lining material 70 via a hose 96a from a compressor 96, which is a compressed air supply means mounted on a ground-based work vehicle 94a. The compressed air introduced into the closed space 84 expands the diameter of the tubular lining material 70, causing it to press against the inner surface of the existing pipe 80. As a result, the outer surface of the tubular lining material 70 adheres tightly to the inner surface of the existing pipe 80 (diameter expansion process). The air introduced from one end of the tubular lining material 70 is discharged to the outside via a hose 96b connected to the other end. The discharged air is sent to a deodorizing device 98 mounted on a ground-based work vehicle 94b, where odor-causing substances are removed.

[0066] Subsequently, a light irradiation device 86 introduced into the tubular lining material 70 irradiates light from the inside of the tubular lining material 70. This hardens the curable resin composition of the tubular lining material 70, forming a reconditioned pipe made of resin inside the existing pipe 80 (hardening process). The light irradiation device 86 is connected to a towing rope 87 of a towing device (not shown), and can be moved inside the tubular lining material 70 by pulling the towing rope 87. After the tubular lining material 70 has hardened, the inner film 72 is peeled off as needed. Figure 9 shows an example in which a photocurable resin composition is used as the curable resin composition for the tubular lining material 70. However, in the case of a thermosetting resin composition used for the tubular lining material 70, instead of light irradiation, the tubular lining material 70 is heated by steam or the like supplied into the tubular lining material 70.

[0067] As described above, in the repair work of the existing pipe 80, the tubular lining material 70 is hardened while in close contact with the inner wall surface of the existing pipe 80 by compressed air. If there are inconsistencies in the thickness of the unhardened tubular lining material 70, inconsistencies in thickness may occur in the hardened tubular lining material 70, or differences in the diameter expansion ratio when the tubular lining material 70 is in close contact may occur, potentially causing wrinkles to form on a part of the tubular lining material 70. In the tubular lining material 70 manufactured by the manufacturing apparatus 10 of this embodiment, the thickness of the tubular lining material 70 can be made uniform by controlling the tension acting on the strip prepreg 74 during manufacturing, thereby reducing defects that occur after hardening and improving the quality of the tubular lining material 70 after repair.

[0068] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0069] For example, in this embodiment, a position adjustment mechanism 41 is provided on the second support portion 40, but the position adjustment mechanism 41 can be configured to be provided on at least one of the first support portion 30 and the second support portion 40.

[0070] Furthermore, for example, the tubular lining material 70 manufactured by the manufacturing apparatus 10 of the present invention may have a sheet layer made of a thin sheet that is smoother than the surface of the fiber-reinforced resin material 10 between the inner film 72 and the fiber-reinforced resin layer 75, and / or between the fiber-reinforced resin layer 75 and the outer film 76 (or between the fiber-reinforced resin layer 75 and the roving cloths 77a and 77b if roving cloths 77a and 77b are present). For example, the inner film 72 may be removed after the tubular lining material 70 has hardened, but by providing a smooth sheet layer (inner sheet layer) on the inner circumferential surface side of the fiber-reinforced resin layer 75, the inner surface of the tubular lining material 70 after repair can be made smooth. In addition, by providing a watertight sheet layer (outer sheet layer) on the outer circumferential surface side of the fiber-reinforced resin layer 75, the watertight performance of the tubular lining material 70 after repair can be improved. This sheet layer can be formed, for example, by spirally winding a smooth, thin, strip-shaped sheet around the outer surface of the inner film 72 before winding the strip-shaped prepreg 74, and / or by spirally winding a smooth, thin, strip-shaped sheet around the outer surface of the tubular body 78 before covering it with the outer film 76. The manufacturing apparatus 10 shown in Figures 3 and 4 can be used to wind the thin sheet. That is, a strip-shaped sheet can be drawn out from a roll-shaped sheet in which the sheet has been wound into a cylindrical shape and wound, and even in this sheet winding, the torque adjustment unit 16 makes it possible to maintain a constant tension on the sheet. [Explanation of Symbols]

[0071] 10. Manufacturing apparatus for tubular lining material 12 Mandrels 14 Feed axis 16 Torque adjustment section 16a Braking force adjustment means 22. Device frame 24 Winding mechanism 30 First support 40 Second support 41 Position adjustment mechanism 70 Tubular lining material 72 Inner film 74 Strip-shaped prepreg 73 Roll-type prepreg 76 Outer film

Claims

1. In a manufacturing apparatus for tubular lining materials, in which a strip-shaped prepreg, in which a fibrous base material is impregnated with a curable resin, is wound spirally around a cylindrical inner film, A columnar mandrel on which the inner film is attached to the outer surface, A feed shaft is positioned at a predetermined distance from the mandrel, has a rotation axis inclined at a predetermined angle with respect to the axial direction of the mandrel, and is fitted into the roll-shaped prepreg formed by winding the strip-shaped prepreg, and rotates together with the roll-shaped prepreg. A winding mechanism that rotates the feed shaft in the circumferential direction of the mandrel to wind the strip-shaped prepreg drawn from the roll-shaped prepreg onto the inner film, A torque adjustment unit is provided on the feed shaft, which can adjust the torque that rotates the feed shaft by applying a braking force to the feed shaft, and adjusts the torque so that the tension acting on the strip prepreg is substantially constant during the winding of the strip prepreg onto the inner film by the winding mechanism. A manufacturing apparatus for tubular lining material, characterized by comprising the following:

2. The torque adjustment unit is A radius calculation means for calculating the radius of the roll-shaped prepreg, which decreases as the strip-shaped prepreg is pulled out, from the rotation angle of the feed axis, A braking force adjustment means that reduces the braking force applied to the feed shaft in accordance with the reduction in radius calculated by the radius calculation means, The apparatus for manufacturing tubular lining material according to claim 1, characterized by comprising:

3. The apparatus for manufacturing tubular lining material according to claim 2, characterized in that the braking force adjustment means is an air brake that applies braking force to the feed shaft by air pressure.

4. The winding mechanism is provided with a first support portion that supports one end of the feed shaft, and a second support portion that supports the other end of the feed shaft, The apparatus for manufacturing tubular lining material according to claim 1 or 2, characterized in that the first and / or second support portion is equipped with a position adjustment mechanism that allows the position of the end of the supporting feed shaft to be changed or adjusted.

5. The position adjustment mechanism is, The apparatus for manufacturing a tubular lining material according to claim 4, comprising: a screw shaft attached to the winding mechanism and extending radially in the direction of the mandrel; a nut that can reciprocate along the screw shaft; and a support connected to the nut and supporting the end of the feed shaft.

6. A method for manufacturing a tubular lining material using the manufacturing apparatus for tubular lining material described in claim 1, An inner film mounting step of attaching the inner film to the outer surface of the mandrel, A roll-shaped prepreg mounting step involves mounting a roll-shaped prepreg, which is formed by winding the strip-shaped prepreg, onto the outer surface of the feed shaft. The process includes winding the strip-shaped prepreg with its leading edge wrapped around a cylindrical inner film, and using the winding mechanism, rotating the feed shaft in the circumferential direction of the mandrel to wind the strip-shaped prepreg onto the inner film, A method for manufacturing a tubular lining material, characterized in that, in the winding step, the torque adjustment unit reduces the braking force applied to the feed shaft so that the tension acting on the strip prepreg remains substantially constant, in accordance with the roll-shaped prepreg whose radius gradually decreases during the winding of the strip-shaped prepreg onto the inner film.

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